Mean zonal winds and planetary waves induced by internal gravity wave packets

Computer Science – Numerical Analysis

Scientific paper

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Convection, Equatorial Regions, Gravity Waves, Internal Waves, Planetary Waves, Polar Regions, Stability, Vorticity, Winds Aloft, Mathematical Models, Numerical Analysis, Primitive Equations

Scientific paper

The generation of mean zonal winds and planetary waves induced by internal gravity wave packets are investigated by numerical experiments. The numerical model is a 3-dimensional primitive equation model on the equatorial beta-plane with boundaries at the equator and North Pole. Because of equatorial boundary conditions, equatorial symmetric modes only are included in the model. Internal gravity wave packets are produced by thermal heating at the bottom boundary. Because of restriction of grid size, convective instability is parameterized by time-independent vertical and horizontal eddy viscosity. Other dissipation mechanisms (e.g., Newtonian cooling, ion drag, molecular viscosity etc.) are also included in the model.

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